Hopefully this article will help you to understand the complicated subject of Titles and Honours in Great Britain:
Titles of nobility (peerages) are conferred by the monarch. In most hereditary peerages, the title is passed on to a peer's oldest son or in the absence of a son, to his closest male heir. The title becomes extinct if there is no male heir, although some ancient peerages allow the title to be passed to a daughter in that case.
Life peerages are created each year by the monarch for distinguished persons.
Life peers hold the rank only for their own lives, and as such, the titles do not pass on to their children. A man or a woman may be granted a life peerage; the titles given to them are Baron or Baroness.
Feudal Barons are holders of Lands that has by charter been erected by the Crown in liberam baronium, giving the owner, whether by inheritance or by acquisition, a whole bundle of land, mineral, and other rights, including certain rights of public justice, privileges not belonging to ordinary estates and unlike Life Peerage and hereditary Peerage it does not become extinct. There are also Feudal Dukedoms, Marquisates ( i.e. Huntley ) and Earldoms (i.e. Aaran)
Duke, Duchess
Created 1337. Highest rank of peerage.
Marquis (also Marques), Marchioness
Created 1385. Rank above Earl, below a Duke.
Earl (Count), Countess
Created c.800. Chief royal representative in the shires, replacing the Anglo Saxon equivalent, "ealdorman".
Viscount, Viscountess
Created 1440. Rank in peerage below Earl, above Baron. Originally, a viscount was a sheriff of a shire (county) and was the Earl's deputy.
Lords of Parliament ( Scotland only)
A group of Feudal Barons chosen to represent other barons in the Scottish Parliament during the 16th century, who by custom were elevated to a higher position than other Feudal Barons, this was a subject of a litigation between a group of Baron vs. Lord Lyon in June 1673 ( See note below)
Feudal Baron, Baroness
Created c.1066. Lowest rank of the peerage ( Scottish Feudal Barons are no longer Peers by some accounts, however there is not a clear Act of Parliament to support that view, only that they were exempt from attending Parliament at their own request), usually applied to tenants-in-chief, the holders of land granted to them directly by the monarch.
Life Baron, Baroness (By Writ )
Lowest rank of the peerage, created by writ in the case of lords or barons of parliament, normally by indication of the Government of the day, in some case also by indication of the HM Loyal Opposition.
Baronet,
Created 1611. A special hereditary rank, above Knight and below Baron, introduced by James I for the purpose of raising money for the suppression of the rebellion in Ulster. Baronets were required to pay £1,080 for the privilege of their rank. The last Baronet created in the UK was Sir Dennis Thatcher, title today in the Hands of Sir Mark Thatcher, the former PM's son.
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